Michael,
There are a whole lot of variables in your question.
Listing prices rise when there is a shortage of inventory.
Median sales prices, well you need to compare apples to apples. In rural markets with a mix of Mfg homes and site built median price may actually mean nothing.
Units sold is very important however in a normal market quantity sold varies on a seasonal basis and with the availability of mortgage money.
Real estate agents and sellers must understand the market has changed. The market is price driven (REO'S, foreclosures, etc).